I was searching on the internet as to how a patrol diff lock works and I stumbled across this web site. Mungst the refference doc. Their are workshop manual and service manuals.
Unfortunetly you have to install the app to be able to read the manuals, but it works well.

I had a quick look at my downloaded copy to see if the one you have found was a later version than mine, but mine is 2.5 while the other is 2.4. I downloaded mine years ago from a link on the Nissan Australia forum site. As you say, it certainly answers a lot of questions. If you stumble upon a later version I would appreciate another post like the one you did.